Abstract: A module for making a modular ferry and/or a floating bridge including a floatation tank, where the floatation tank is made in the form of two floatation half-tanks hinged together around a hinged line between an opening position in which the two half-tanks are substantially aligned and form the floatation tank, and a closing position in which a half-tank is folded back upon the other half-tank such as a lid thus forming a container box able to enclose all or part of the elements for making the ferry or floating bridge.